They'll use Glocks until the end of time.
And I'm definitely a bit sore I missed out on the surplus berettas. I had to choose between that and paying down student loans. I ultimately made the better choice (paid it off and bought 2x as many guns later).
M16's.
Lemme tell you about the government.
It took an act of congress to get a few 1911's released from the giant stockpile the Gov still has. It was lobbied against, HARD. No collector wants any new guns coming on to the market and collectors have deep pockets and rub wallets with politicians.
Secondly, any GOV weapon that was ever capable of automatic fire will NEVER be sold to the public. Any parts that touched bullets will NEVER be sold to the public, all parts and receivers will NEVER make it past a shredder.
I've tried time and time again, it's no use. Even the buffers and springs get shredded. I can buy scrap shreddings, but not parts.
Current "M16 Parts Kits" are from years ago before the shredder requirement.
I've busted my tail time and time again trying to buy this stuff, it's impossible.
I've seen a lot of that, unfortunately it was imported around the time the Star BM was and it hasn't taken off. (I'm looking for project guns)
The benefits of various other weapons is that some places are selling them in parts so you can assembly and file the parts to fit as necessary.
That's a roach, no amount of bullets will exterminate them.
Hire an exterminator asap.